43135531 has 2 divisors, whose sum is σ = 43135532. Its totient is φ = 43135530.

The previous prime is 43135489. The next prime is 43135537. The reversal of 43135531 is 13553134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43135531 - 2⁹ = 43135019 is a prime.

It is a super-2 number, since 2×43135531² = 3721348069303922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43135496 and 43135505.

It is not a weakly prime, because it can be changed into another prime (43135537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21567765 + 21567766.

It is an arithmetic number, because the mean of its divisors is an integer number (21567766).

Almost surely, 2^43135531 is an apocalyptic number.

43135531 is a deficient number, since it is larger than the sum of its proper divisors (1).

43135531 is an equidigital number, since it uses as much as digits as its factorization.

43135531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 25.

The square root of 43135531 is about 6567.7645359742. The cubic root of 43135531 is about 350.7074967798.

Adding to 43135531 its reverse (13553134), we get a palindrome (56688665).

The spelling of 43135531 in words is "forty-three million, one hundred thirty-five thousand, five hundred thirty-one".